Hi David,
Apologies for the delay in getting back to you.
- Looking at your schematic, it looks like there is a missing decoupling capacitor for Vcc pin.
- Secondly, the 0 ohm resistor must be connected to the junction of the two feedback resistors, currently in your design it is connected to Vout rail. Kindly correct this as shown in our EVB datasheet for this part. I missed this before.
After looking at the layout, your feedback resistors are not close to the IC pin due to every component placed in the top player, which is not as per recommended in our datasheet.
Kindly follow the layout guidelines as mentioned in our datasheet and EVB.
Regards,
Adhish